BANKRUPTCY AND RELATED MATTERS Debtors in Possession Unaudited Condensed Combined Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 153,885		$ 178,055
Restricted cash	38,910		0
Accounts receivable	228,793		216,791
Inventories	113,514		121,308
Assets held for sale	0		5,350
Prepaid expenses and other current assets	42,545		44,009
Total current assets	577,647		565,513
Intercompany investment	0		0
Intercompany notes receivable	0		0
Property and equipment, net	1,678,300		1,834,180
Right-of-use asset	331,743		0
Other assets	94,899		116,267
Total assets	2,792,575		2,652,599
Current liabilities:
Accounts payable	93,433		99,573
Accrued liabilities	58,434		38,679
Accrued interest	2,649		17,174
Current portion of operating lease liabilities	83,630		0
Short-term borrowings and current maturities of long-term debt	947,041		1,418,630
Total current liabilities	1,273,063		1,668,851
Long-term debt, less current maturities	75,611		8,223
Other liabilities and deferred credits	7,905		26,229
Deferred taxes	59,862		111,203
Long-term operating lease liabilities	251,399		0
Liabilities not subject to compromise	1,686,546		1,840,232
Liabilities subject to compromise	624,867		0
Total Liabilities	2,311,413		1,840,232
Total Bristow Group stockholders’ investment	480,712		805,219
Noncontrolling interests	450		7,148
Total stockholders’ investment	481,162	$ 655,842	812,367	$ 976,076	$ 1,126,245	$ 1,183,501
Total liabilities and stockholders’ investment	2,792,575		$ 2,652,599
Debtor In Possession [Member]
Current assets:
Cash and cash equivalents	39,093
Restricted cash	34
Accounts receivable	43,395
Intercompany Accounts Receivable	458,008
Inventories	35,658
Prepaid expenses and other current assets	11,250
Total current assets	587,438
Intercompany investment	633,197
Intercompany notes receivable	377,069
Property and equipment, net	1,323,267
Right-of-use asset	298,860
Other assets	7,998
Total assets	3,227,829
Current liabilities:
Accounts payable	37,586
Intercompany accounts payable	109,756
Accrued liabilities	56,618
Accrued interest	2,418
Intercompany accrued interest	4,365
Current portion of operating lease liabilities	84,927
Short-term borrowings and current maturities of long-term debt	831,778
Total current liabilities	1,127,448
Long-term debt, less current maturities	34,161
Intercompany notes payable	77,422
Other liabilities and deferred credits	4,599
Deferred taxes	40,287
Long-term operating lease liabilities	217,421
Liabilities not subject to compromise	1,501,338
Liabilities subject to compromise	624,867
Total Liabilities	2,126,205
Total Bristow Group stockholders’ investment	1,100,351
Noncontrolling interests	1,273
Total stockholders’ investment	1,101,624
Total liabilities and stockholders’ investment	$ 3,227,829